Just in time for the Journal’s new Wireless Savings Calculator, Verizon Wireless today quietly added one more option to its Share Everything phone plans.

Verizon simplified its smartphone plans last year to 14 different options — all have unlimited voice and text; you select the monthly allotment of data starting from 1 GB, which costs $80 a month including a smartphone.

Today, Verizon added a lower-tier, a 500-megabyte data plan that is $10 cheaper with a smartphone. The move comes only days after AT&T introduced a 300 MB option that costs half as much as its 1 GB monthly data allotment.

While T-Mobile and Sprint have expanded into unlimited data, AT&T and Verizon have been moving the other way, nixing unlimited plans and offering a slew of smaller incremental options.

Back to our Wireless Savings Calculator, which has been adjusted to include the new Verizon 500 MB plan.

If you search for the cheapest smartphone options with unlimited voice and text, you’ll see Verizon’s plan is still the most expensive. T-Mobile offers the same amount of data but it’s $30 cheaper. (T-Mobile also requires you to pay for the full cost of a phone if you don’t bring your own.) The cheapest plans from AT&T and Sprint both cost $10 less than Verizon’s, but AT&T offers 300MB of data, while Sprint offers 1GB — twice as much as Verizon.